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ALLOWANCES FOR DOUBTFUL RECEIVABLES (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Allowances for accounts receivable
   
Movement of allowances    
Beginning of the year $ 1,822 $ 1,090
Allowances made during the year/period 2,734 852
Write off   (143)
Foreign exchange effect (145) 23
Closing balance 4,411 1,822
Allowances for other receivables
   
Movement of allowances    
Beginning of the year 8,696 8,739
Allowances made during the year/period 203 4
Write off   (48)
Foreign exchange effect 2 1
Closing balance 8,901 8,696
Allowances for advances for purchases of property, plant and equipment
   
Movement of allowances    
Beginning of the year 1,276 1,268
Reversal made during the year/period (7) (5)
Foreign exchange effect 19 13
Closing balance 1,288 1,276
Allowances for advances to suppliers
   
Movement of allowances    
Beginning of the year 4,425 4,406
Allowances(reversal) made during the year/period (18) 2
Foreign exchange effect 26 17
Closing balance $ 4,433 $ 4,425